/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.pvm.process;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.activiti.engine.impl.pvm.PvmProcessElement;

/**
 * common properties for process definition, activity and transition including event listeners.
 *
 * @author Tom Baeyens
 */
public class ProcessElementImpl implements PvmProcessElement {

    private static final long serialVersionUID = 1L;

    protected String id;
    protected ProcessDefinitionImpl processDefinition;
    protected Map<String, Object> properties;

    public ProcessElementImpl(String id, ProcessDefinitionImpl processDefinition) {
        this.id = id;
        this.processDefinition = processDefinition;
    }

    public void setProperty(String name, Object value) {
        if (properties == null) {
            properties = new HashMap<>();
        }
        properties.put(name, value);
    }

    @Override
    public Object getProperty(String name) {
        if (properties == null) {
            return null;
        }
        return properties.get(name);
    }

    @SuppressWarnings("unchecked")
    public Map<String, Object> getProperties() {
        if (properties == null) {
            return Collections.EMPTY_MAP;
        }
        return properties;
    }

    // getters and setters //////////////////////////////////////////////////////

    @Override
    public String getId() {
        return id;
    }

    public void setProperties(Map<String, Object> properties) {
        this.properties = properties;
    }

    @Override
    public ProcessDefinitionImpl getProcessDefinition() {
        return processDefinition;
    }
}
